I5 is either dual core or quad core.
i5 performance is more than sufficient; they will not need the extra performance of the i7 series if their use is limited to web browsing, email, watching video and office/productivity apps. ore i7 processors have an advantage for processor-intensive applications such as video encoding and rendering, 3D modeling, high-end graphics work and gaming. 
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For the most part, you'll get faster CPU performance from Core i7 than Core i5. The majority of Core i7 desktop CPUs are quad-coreprocessors, while many mobile Core i5 processors are dual core. This is not always the case, as there are dual-core mobile Core i7 processors and several quad-core desktop Core i5 CPUs.
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